Refactor code structure for improved readability and maintainability

Author: Dhanushree-Microsoft

src/backend-api/pyproject.toml

@@ -16,8 +16,8 @@ dependencies = [
     "fastapi[standard]==0.116.1",
     "httpx==0.28.1",
     "pydantic-settings==2.10.1",
-    "python-dotenv",
-    "python-multipart==0.0.22",
+    "python-dotenv==1.2.2",
+    "python-multipart==0.0.26",
     "protobuf==7.34.0",
     "sas-cosmosdb==0.1.4",
     "semantic-kernel[azure]==1.40.0",
@@ -34,6 +34,9 @@ override-dependencies = [
     "aiohttp==3.13.4",
     "azure-core==1.38.0",
     "urllib3==2.6.3",
+    "requests==2.33.0",
+    "werkzeug==3.1.4",
+    "pygments==2.20.0",
     "black==26.3.1",
     "cryptography==46.0.7",
     "pyjwt==2.12.0",